megajolt and bike carbs?

[baz-r]

Originally Posted by wylliezx9r

You'll also find that you get better throttle response using TPS rather than MAP. MAP is only really neccesary for charged cars and emmission control.

i dont realy agree as its really more of an engine dependent factor rather than rule of thumb

both tps (alpha-numeric) and map (%baro) have there limitations for mesureing engine load

tps is poor at mesuring load as its has no way of knowing what load is on the engine (eg cruse and overun) and poor scaling for small tps movements away from idle so its useless for road driving

map works well unless you either have poor vacum at idle eg 65kpa or higher (wild cams with lots of valve overlap in 8v engines) and is not too acurate past 90% atmosperic pressure

for ignition only setups like megajolt you only need to work out engine load for added part load ign advance! so all we need to know is how full a cyl is and inlet pressure is the best way to do this and easy to set up as past 80-100% baro you need no extra advance.

people rattle on about tps to be used for bike carbs but its rubbish and most carbs off bikes are cv type so tps is not a true mesurment as carb slides control actual inlet aperture size! for what ists worth you may as well be 2d and have fixed advance for revs.

its not like we have to calcualte anything for fueling unless we have a turbo then we would have to take out advance under boost